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Typically, the observation platforms of landmark buildings are designed to offer breathtaking views of the city, not vice versa. At the ARoS Museum of Modern Art in Aarhus, Denmark, the recently completed viewing tower on the roof is its own work of art. Designed by renowned Danish/Icelandic artist Olafur Eliasson, the circular glass walkway is a multi-colored halo crowning the brick cubic structure built in 2003 by Aarhus-based Schmidt Hammer Lassen Architects.

Known locally as “Your Rainbow Panorama,” the museum’s walkway invites visitors to see the city through curved colored glass arranged in the color spectrum. Explaining his intent, Eliasson says, “I have created a space which virtually erases the boundaries between inside and outside – where people become a little uncertain as to whether they have stepped into a work or into part of the museum. This uncertainty is important to me, as it encourages people to think and sense beyond the limits within which they are accustomed to moving.”

A spectacular façade isn’t all that the Kuggen, an office building in Gothenburg, Sweden, is all about. It is totally sustainable too. Designed by Winngardh Arkitektkontor, the Kuggen was inspired by a cog wheel (hence its name in Swedish) and the saw-toothed edges of a leaf.